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The mass number of a substance represents the sum of total number of | |
A. | protons and neutrons in an atom [Wrong Answer] |
B. | protons and electrons in an atom [Wrong Answer] |
C. | neutrons and electrons in an atom [Wrong Answer] |
D. | protons and neutrons in a nucleus [Correct Answer] |
E. | protons and electrons in a nucleus. [Wrong Answer] |